Leisurely Sunday Brunch

I'm coming to Chicago (from NYC) next weekend to surprise a very close friend for her 40th birthday. I'm arriving on Saturday afternoon, attending her party on Saturday night, and then we have most of the day to spend together on Sunday (I'm leaving Sunday evening). She has been sorta depressed (marriage not so good, considering divorce), so I'd like it to be a really nice day.

My friend lives on N. Lakeshore Drive and for brunch, I've narrowed it down to NoMi, North Pond, The Lobby at the Peninsula or maybe Seasons. I will also be making arrangements for some spa treatments in the morning before we have a (hopefully) nice and leisurely brunch. (For spas, considering The Park Hyatt Hotel or The Peninsula Hotel so any thoughts or suggestions for spas in that area would be welcome too!).

Not too concerned about cost, just really can't decide. Any thoughts would be greatly appreciated...thanks!